Pruning saw



FIG. 1 is a left side elevational view of a pruning saw showing my design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for a pruning saw, as shown and described. 